1-Amino-4-(4-methoxyphenyl)-4H,5H-(1)benzothiopyrano(4,3-b)pyran-3-carbonitrile-6-sulfone 135521-76-5 4H,5H-(1)Benzothiopyrano(4,3-b)pyran-3-carbonitrile, 2-amino-4-(4-methoxyphenyl)-, 6,6-dioxide BRN 4274480